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通过在丰水年(1998年)和欠水年(1999年)连续两个生长季对皇甫川流域主要灌木沙棘、沙柳和柠条的生物学特性、蒸腾特征及土壤水分含量的测定及分析,得出结果为:三种灌木蒸腾强度在晴天和阴天表现的日变化规律不同。在丰水年和欠水年的生长季内,三种灌木蒸腾强度均随土壤含水量和降雨量的增减而增减,环境因子综合作用于灌木蒸腾的过程。无论丰水年还是欠水年,三种灌木地上生物量的增长与蒸腾耗水量均呈同步增长,生长季内皇甫川流域主要灌木蒸腾系数均较高,灌木的生长是以消耗大量水分为代价,水分是其生长的主要限制因子之一;柠条蒸腾系数较小,这反映了柠条能较有效利用水分,积累干物质,适合于在皇甫川流域生长;通过测定与计算,皇甫川流域沙棘适宜盖度为61%～79%、柠条为43%～55%、沙柳为46%～59%。
The biological characteristics, transpiration characteristics and soil water contents of the main shrubs, Salix psammophila and Caragana korshinskii in the Huangfuchuan watershed were studied in two consecutive growing seasons in the Fengshui years (1998) and the year of under water years (1999) The results showed that the daily variation of transpiration intensity of three shrubs in sunny and cloudy days were different. The transpiration intensity of three shrubs both increased and decreased with the increase and decrease of soil water content and rainfall during the wet season and the growing season of dry years, and the environmental factors integrated the transpiration of shrubs. Both the wet years and the dry years, the aboveground biomass and transpiration water consumption of three shrubs increased synchronously, and the transpiration coefficients of main shrubs in Huangfuchuan watershed were higher during the growing season, and the growth of shrubs was at the expense of consuming a large amount of water , Water is one of the main limiting factors for its growth; Caragana korshinskii transpiration coefficient is small, which reflects that Caragana korshinskii can use water more effectively and accumulate dry matter, which is suitable for growing in Huangfuchuan watershed. Through the measurement and calculation, Seabuckthorn appropriate coverage of 61% to 79%, Caragana is 43% to 55%, Salix is 46% to 59%.